JP2014052050A - Damper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damper device which prevents the device from being broken when a moving speed of a movable body is large.SOLUTION: A damper device 100 has a slider 1 and a cylinder 2 arranged on a hollow part of the slider 1. Filler 21 and magnetic fluid 22 are arranged on an inner part of the cylinder 2. When the slider 1 is moved downward, the magnetic fluid 22 is moved downward in the filler 21 so as not to be separated from a magnet 13 and, on the other hand, the movement is blocked because of receiving a resistance from the filler 21. The magnet 13 receives an attraction force from the magnet fluid 22 to give rise to an actuation for reducing speed of the slider 1 and a function as the damper is exhibited. Meanwhile, when moving speed of the slider 1 is large, the magnetic fluid 22 cannot follow the magnet 13, therefore, the magnet 13 gets away from the magnet fluid 22 and the attraction force is not generated between the magnet and the magnetic fluid. As the result, the magnet 13 is moved without reducing the speed, and the magnetic fluid 22 is hardly moved and does not function as the damper.

Description

  The present invention relates to a damper device that absorbs vibration.

  As a damper device that absorbs vibration in one direction, a damper device that includes a cylinder filled with a fluid (such as a magnetic fluid), a piston that moves in the cylinder, and a mechanism that can adjust a damping force is known. . As a mechanism for adjusting the damping force, in Patent Document 1, orifices are provided on the upper and lower surfaces of the piston, and the opening of the orifice is adjusted by deforming a valve plate that closes the orifice. Thereby, the damping force is adjusted by changing the amount of fluid passing through the orifice.

JP 2007-225023 A

  In the configuration of Patent Document 1, when the piston moves in the cylinder and presses the fluid, a part of the fluid passes through the orifice, but other fluid is pressed between the piston and the lower surface (or upper surface) of the cylinder. Thus, the piston receives resistance from the fluid. This resistance increases as the moving speed of the piston increases, and when the moving speed of the piston is very high, the resistance becomes very large, which may change the spring characteristics of the device itself. In extreme cases, the device may be damaged, or an excessive force may be applied to the machine side, resulting in damage to the machine side.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a damper device that does not break even when the moving speed of the moving body is high, and to provide a damper device that does not apply excessive force to the machine side in such a case. .

  The damper device of the present invention includes a cylindrical member and a movable body that is disposed outside the cylindrical member and is movable along the extending direction of the cylindrical member. A filler filled along the extending direction of the cylindrical member and a magnetic fluid passing through the filler are arranged, and the moving body is provided with a magnet.

  In the present invention, when the moving body moves in the extending direction of the cylindrical member, the magnet provided on the moving body and the magnetic fluid in the cylindrical member attract each other, so that the magnetic fluid is not separated from the magnet. Although an attempt is made to move in the filler at a constant speed, the movement of the magnetic fluid is slowed because the movement is prevented by receiving resistance from the filler. When the magnet receives the attractive force from the magnetic fluid, an action of decelerating the moving body is generated, and functions as a damper device. However, when the moving speed of the moving body is high, since the magnetic fluid cannot follow the magnet, the magnet suddenly moves away from the magnetic fluid, and no attractive force is generated between the magnet and the magnetic fluid. As a result, the magnet moves without being decelerated, but the magnetic fluid hardly moves. That is, it does not function as a damper device. After that, when the magnet is brought close to the magnetic fluid, a force attracting each other is generated, so that it functions as a damper device again. Therefore, even if the moving speed of the moving body is high, the apparatus is not damaged as in the prior art, and an excessive force is not applied to the machine side. Moreover, even if it does not function as a damper device, the damper function is exhibited again by bringing the magnet closer to the magnetic fluid, so that it is not necessary to newly provide a configuration for returning the damper function. Furthermore, since the moving body is disposed outside the cylindrical member and does not directly press the magnetic fluid, a large pressure is not applied to the magnetic fluid in the cylindrical member. Therefore, the magnetic fluid does not leak out of the cylindrical member, and the deterioration of the magnetic fluid can be suppressed.

  The filler is preferably made of a ferromagnetic material. When the filler is made of a ferromagnetic material, the magnetic flux density in the cylindrical member (in the filler) can be increased. Thereby, since the force attracted by the magnet and the magnetic fluid is increased, the vibration absorption force can be improved.

  Further, in the above configuration, the cylindrical member extends in a straight line, and in the cylindrical member, a space formed at both ends in the longitudinal direction with a filler interposed therebetween, and two of the both ends. It is preferable that a communication path for communicating the two spaces is formed. When the moving body moves, the magnetic fluid follows the magnet and moves toward the end of the cylindrical member, so that the gas in the space at the end of the cylindrical member is pressed to receive resistance. Fluid movement is impeded. However, by providing the communication path, the gas in the space can be discharged to another space through the communication path, so that the resistance due to the gas in the space can be reduced. Therefore, when the moving body moves, it is possible to avoid a situation in which the magnetic fluid cannot follow the magnet and hardly moves.

  In addition, in the above configuration, the cylindrical member is preferably formed in an annular shape. By adopting such a shape, the present invention can be effectively applied to a rotary damper.

  According to the damper device of the present invention, when the moving speed of the moving body is high, the magnetic fluid cannot follow the magnet, so that it does not function as the damper device. However, when the magnet is brought close to the magnetic fluid, a force attracting each other is generated, so that it functions as a damper device again. Therefore, even if the moving speed of the moving body is high, the device does not function as a damper device and is not damaged. Moreover, even if it does not function as a damper device, it functions as a damper device again when the magnet is brought close to the magnetic fluid, so that it is not necessary to newly provide a configuration for returning the damper function.

It is sectional drawing of the damper apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the action | operation of the damper apparatus shown in FIG. It is sectional drawing of the damper apparatus which concerns on 2nd Embodiment of this invention. (A) is a front view of the damper device concerning a 3rd embodiment of the present invention, and (b) is a sectional view which met an IVB-IVB line of (a). It is sectional drawing of the damper apparatus shown in FIG. 4, (a) is sectional drawing along the VA-VA line of FIG.4 (b), (b) is along the VB-VB line of FIG.4 (b). FIG. It is sectional drawing which shows operation | movement of the damper apparatus shown in FIG.

  Hereinafter, embodiments of the present invention will be described.

[First Embodiment]
First, the damper apparatus 100 which is 1st Embodiment of this invention is demonstrated below, referring FIG.1 and FIG.2.

(Damper device)
As shown in FIG. 1, the damper device 100 supports a hollow cylindrical slider (moving body) 1, a cylinder (cylindrical member) 2 disposed inside the slider 1, and a lower end of the cylinder 2. A stand 3 is provided. A spring 4 is disposed between the lower end of the slider 1 and the support base 3.

<Slider>
The slider 1 has a substantially cylindrical tube portion 11 and a substantially disk-shaped head portion 12 provided at the upper end of the tube portion 11. The cylinder portion 11 extends in a straight line in the vertical direction, and a cylindrical magnet 13 is provided at the lower end portion. An external member is connected to the head 12, and the slider 1 can move in the vertical direction by the vibration of the external member. The slider 1 is formed with a hollow portion 14 that penetrates the cylindrical portion 11 and the head portion 12 in a straight line, and the cylinder 2 is disposed in the hollow portion 14.

<Cylinder>
The cylinder 2 is a cylindrical member extending in the vertical direction, and is sealed by closing an upper end and a lower end. A filler 21 is disposed along the vertical direction in the cylinder 2, and a magnetic fluid 22 is disposed in the filler 21. In addition, spaces 23 and 24 are formed at the upper end portion and the lower end portion of the cylinder 2 with the filler 21 interposed therebetween, respectively.

  The filler 21 has a fine flow path through which the magnetic fluid 22 can pass, and is woven, non-woven, porous ceramics, steel wool, porous metal, porous resin, three-dimensional network structure fiber, cross section It is possible to use a tubule-like thin tube or sponge-like material. Further, a plate in which a plurality of plates with holes are arranged by shifting the positions of the holes may be used as the filler 21. From the above configuration, the magnetic fluid 22 can move inside the filler 21 through the fine flow path of the filler 21. However, when the magnetic fluid 22 is moved, resistance is received from the fine flow path provided in the filler 21, so that it is more difficult to move than when the filler 21 is not disposed. The filler 21 of the present embodiment is made of a ferromagnetic material and uses a material that can transmit magnetic force such as steel wool. Thereby, the magnetic flux density in the cylinder 2 (inside the filler 21) can be increased. Particularly, the magnetic flux density of the filler 21 (steel wool) at the same height as the magnet 13 provided in the cylinder 2 is further increased by the magnet 13. When the magnetic fluid 22 passes through the fine flow path of the filler 21 (steel wool) in this portion, it is possible to obtain a greater damping effect by receiving a greater resistance from the fine flow path.

<Spring>
The spring 4 is disposed so as to surround the cylinder 2 below the slider 1 and expands and contracts in the vertical direction. In the present embodiment, the spring 4 is disposed below the slider 1. However, regardless of this form, the spring 4 may be disposed above the slider 1, or may be disposed above and below the slider. .

  Next, the operation of the damper device 100 will be described with reference to FIGS. 1 and 2.

  When the slider 1 is at rest, as shown in FIG. 1, the magnet 13 at the lower end of the slider 1 and the magnetic fluid 22 in the cylinder 2 attract each other, so that the magnetic fluid 22 has substantially the same height as the magnet 13. Is arranged.

However, when the slider 1 moves downward at the speed V _S1 , as shown in FIG. 2A, initially, the interior of the filler 21 is kept at the same speed V as the slider 1 so that the magnetic fluid 22 does not leave the magnet 13. _{At S1} , the slider 1 and the magnetic fluid 22 appear to move downward (the apparent speed is quite low and the same), but the magnetic fluid 22 receives a resistance proportional to the speed from the filler 21, so Movement is hindered. Then, as the speed of the slider 1 increases, a speed difference is generated between the magnetic fluid 22 and the slider 1, and the magnetic fluid 22 moves downward at a speed V _G1 that is slower than the speed V _S1 (V _G1 <V _S1 ). Then, when the magnet 13 receives the attractive force from the magnetic fluid 22 as described above, an action of decelerating the slider 1 is generated, and a function as a damper device is generated. Since the velocity V _G1 of the magnetic fluid 22 is slower than the moving velocity V _{S1 of} the slider 1, the distance between the magnet 13 and the magnetic fluid 22 increases as the slider 1 moves. Therefore, the initial movement of the slider 1 when it "distance between the magnet 13 and the magnetic fluid 22 'is a X ₁ (see FIG. 2 (a)), the slider 1 has reached the lowermost position, FIG. 2 ( As shown in b), the “distance between the magnet 13 and the magnetic fluid 22” is Y ₁ greater than X ₁ (Y ₁ > X ₁ ).

On the other hand, the shifting speed of the slider 1, when the slider 1 is moved to rapidly downward at a velocity _{V S2} (velocity _{V S2>} velocity _{V S1),} since the magnetic fluid 22 can not follow the magnet 13, the magnet 13 is magnetic The force attracted between the magnet 13 and the magnetic fluid 22 is not generated away from the fluid 22. As a result, as shown in FIG. 2C, the magnet 13 moves downward at the speed V _S2 without decelerating, but the magnetic fluid 22 hardly moves. That is, it does not function as a damper device.

  Thereafter, when the slider 1 is moved upward and the magnet 13 is brought close to the magnetic fluid 22, a pulling force is generated between the magnet 13 and the magnetic fluid 22, so that it again functions as a damper device.

  As described above, according to the damper device 100 of the present embodiment, when the moving speed of the slider 1 is high, the magnetic fluid 22 cannot follow the magnet 13, so the magnet 13 moves away from the magnetic fluid 22, and between these There is no attraction. Therefore, the magnet 13 moves without being decelerated, but the magnetic fluid 22 hardly moves and does not function as a damper device. However, when the magnet 13 is brought close to the magnetic fluid 22, a force attracting each other is generated, so that it again functions as a damper device. As described above, in this embodiment, when the moving speed of the slider 1 is high, the damper device 100 does not function, so that the damper device 100 is not damaged, and the machine side (the machine side to which the support base 3 is attached) is impossible. It does n’t take much power. Even if the damper device does not function, since the damper function is performed again when the magnet 13 is brought close to the magnetic fluid 22, it is not necessary to newly provide a configuration for returning the damper function.

  Furthermore, since the slider 1 is disposed outside the cylinder 2 and does not directly press the magnetic fluid 22, a large pressure is not applied to the magnetic fluid 22 in the sealed cylinder 2. Therefore, the magnetic fluid 22 does not leak out of the slider 1 and deterioration of the magnetic fluid 22 can be suppressed.

  In addition, since the filler 21 is made of a ferromagnetic material, the magnetic flux density in the cylinder 2 (in the filler 21) can be increased. Thereby, since the force with which the magnet 13 and the magnetic fluid 22 attract can be raised, vibration absorption power can be improved.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment is different from the first embodiment in that a communication pipe 250 is disposed in the cylinder 2. In addition, about the structure same as 1st Embodiment mentioned above, the same code | symbol is used and the description is abbreviate | omitted suitably.

  The communication pipe 250 is a long pipe extending in the vertical direction. The upper end of the communication pipe 250 is disposed in the space 23 at the upper end portion of the cylinder 2, and the lower end is disposed in the space 24 at the lower end portion of the cylinder 2. As a result, a communication path that connects the space 23 and the space 24 is formed in the cylinder 2.

  The damper device 200 also has the same effect as that of the first embodiment. Further, since the space 23 at the upper end and the space 24 at the lower end in the cylinder are communicated by the communication pipe 250, the gas in the spaces 23 and 24 is discharged to the other space 24 and 23 through the communication pipe 250. Can do. Therefore, when the magnetic fluid 22 moves downward and the magnetic fluid 22 follows the magnet 13 and moves downward, the gas in the space 23 is pressed, but the resistance received at this time can be reduced. Similarly, when the magnetic fluid 22 moves upward and the magnetic fluid 22 follows the magnet 13 and moves upward, the gas in the space 24 is pressed, but the resistance received at this time can be reduced. Therefore, it is possible to avoid a situation in which the magnetic fluid 22 cannot follow the magnet 13 and hardly moves when the slider 1 moves.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIGS. The third embodiment is different from the first embodiment in that the cylinder has an annular shape. In addition, about the structure same as 1st Embodiment mentioned above, the same code | symbol is used and the description is abbreviate | omitted suitably.

(Damper device)
As shown in FIG. 4, the damper device 300 includes an elongated slider (moving body) 301 that rotates around a shaft portion, an annular cylinder (tubular member) 302 that is disposed behind the slider 301, and And a support 303 that rotatably supports the cylinder 302. The slider 301, the cylinder 302, and the support body 303 are arranged in this order in the axial direction.

<Slider>
The slider 301 has a rotating part 311 extending in the radial direction and a shaft part 312 provided at the approximate center of the rotating part 311. An external member is connected to the tip of the shaft portion 312, and the slider 301 rotates about the shaft portion 312 as the external member rotates.

  As shown in FIG. 4A, base portions 313 and 314 arranged to overlap the cylinder 302 are provided at both ends of the rotating portion 311. The two base portions 313 and 314 are arranged on opposite sides with respect to the shaft portion 312 and are formed in a fan shape that spreads outward in the radial direction. Further, magnets 315 and 316 having substantially the same shape as the base portions 313 and 314 are attached to the back surfaces of the two base portions 313 and 314 as shown in FIGS. 4B and 5A. Further, yokes 317 and 318 are attached to the back surfaces of the magnets 315 and 316 as shown in FIG. The yokes 317 and 318 are formed with hollow portions 317a and 318a through which the cylinder 302 can be inserted. The yokes 317 and 318 are made of a magnetic material that can transmit magnetic force such as iron.

<Cylinder>
As shown in FIG. 4A and FIG. 5B, the cylinder 302 is a sealed annular member, and a filler 321 is disposed in substantially the entire area inside. In addition, the magnetic fluid 322 is disposed in two different places in the filler 321. The filler 321 has the same configuration as the filler 21 of the first embodiment. In FIG.5 (b), the magnetic fluid 322 is arrange | positioned in the 180 degree rotation symmetrical position (two places).

  Further, the cylinder 302 is substantially surrounded by two yokes 317 and 318 as shown in FIGS. 4B and 5B. The magnetic flux density is high in the portion surrounded by the yokes 317 and 318.

<Support>
As illustrated in FIG. 4B, the support body 303 includes a disk-shaped support portion 331 and a shaft portion 332 provided at the approximate center of the support portion 331. In addition, projecting portions 334 and 335 that project toward the opposite side of the shaft portion 332 are provided on the surface of the support portion 331 facing the cylinder 302. The protrusions 334 and 335 are connected to the cylinder 302, so that the support body 303 and the cylinder 302 are integrated.

  Next, the operation of the damper device 300 will be described with reference to FIGS.

  When the slider 301 is stationary, as shown in FIG. 5, the magnets 315 and 316 of the slider 301 and the magnetic fluid 322 in the cylinder 302 are attracted so that the magnetic fluid 322 is substantially behind the magnets 315 and 316. And disposed in a portion surrounded by the yokes 317 and 318.

However, when the slider 301 rotates counterclockwise at the speed V _S31 , the magnetic fluid 322 tries to move counterclockwise at the same speed V _S31 as the slider 301 so as not to leave the magnets 315 and 316 as shown in FIG. However, since resistance is received from the filler 321 by passing through the inside of the filler 321, movement is hindered. For this reason, the moving speed of the magnetic fluid 322 becomes slow, and the magnetic fluid 322 moves counterclockwise at a speed V _G31 slower than the speed V _S31 (V _G31 <V _S31 ). Then, when the magnets 315 and 316 receive the attractive force from the magnetic fluid 322, an action of decelerating the slider 301 is generated, and a function as a damper device is generated. Since the velocity V _S31 of the magnetic fluid 322 is slower than the moving velocity V _{G31 of} the slider 301, the distance between the magnets 315 and 316 and the magnetic fluid 322 increases as the slider 301 moves. Therefore, “the distance between the magnet 315 and the magnetic fluid 322” is X ₃₁ at the beginning of the movement of the slider 301 (see FIG. 6A), but when the rotation of the slider 301 stops, FIG. as shown in, the larger _Y 31 "distance between the magnet 315 and the magnetic fluid 322" is _{X 31 (> X 31).}

On the other hand, fast rotational speed of the slider 301, when the slider 301 is rapidly rotated left at a speed _{V S32} (velocity _{V S32>} velocity _{V S31),} as shown in FIG. 6 (c), the magnetic fluid 322 is a magnet 315 , 316 cannot be followed, the magnets 315, 316 move away from the magnetic fluid 322, and no attractive force is generated between the magnets 315, 316 and the magnetic fluid 322. As a result, the magnets 315 and 316 do not decelerate and rotate counterclockwise at the speed V _S32 , but the magnetic fluid 322 hardly moves. That is, it does not function as a damper device.

  After that, when the slider 301 is rotated and the magnets 315 and 316 are brought close to the magnetic fluid 322, an attractive force is generated between the magnets 315 and 316 and the magnetic fluid 322, so that it again functions as a damper device.

  As described above, in the damper device 300 of the present embodiment as well, the magnetic fluid 322 cannot follow the magnets 315 and 316 when the rotation speed of the slider 301 is fast, as in the first embodiment. , 316 moves away from the magnetic fluid 322, and no attractive force is generated between the magnets 315, 316 and the magnetic fluid 322. Therefore, the magnets 315 and 316 move without being decelerated, but the magnetic fluid 322 hardly moves and does not function as a damper device. However, when the magnets 315 and 316 and the magnetic fluid 322 are brought close to each other, a force attracting each other is generated, so that it functions as a damper device again. As described above, also in this embodiment, when the moving speed of the slider 301 is high, it does not function as a damper device, the damper device 300 is not damaged, and the machine side (the machine side on which the shaft portion 332 of the support 303 is attached). ) Is not subjected to excessive force. Even if the damper device does not function, the magnet device 315, 316 functions as the damper device again when the magnets 315, 316 are brought close to the magnetic fluid 322, so that it is not necessary to newly provide a configuration for returning the damper function.

  Further, since the filler 321 is made of a ferromagnetic material and the cylinder 302 is substantially surrounded by the yokes 317 and 318, the magnetic flux density in the portion surrounded by the yokes 317 and 318 can be increased. Thereby, since the force with which magnets 315 and 316 and magnetic fluid 322 attract can be raised, vibration absorption power can be improved.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is defined not by the above description but by the scope of claims for patent, and all modifications within the meaning and scope equivalent to the scope of claims for patent are included.

  For example, in the first to third embodiments described above, the filler is made of a ferromagnetic material, but the filler may not be a ferromagnetic material.

  Further, in the second embodiment, the communication pipe 250 is arranged in the cylinder 2 to allow the upper end space 23 and the lower end space 24 to communicate with each other, but means for communicating these two spaces 23, 24 is communicated. It is not limited to the tube 250. For example, a through-hole that allows the spaces 21 and 24 to communicate with the filler 21 may be formed without arranging the communication pipe 250.

  Furthermore, in the first embodiment and the second embodiment, the spring 4 is disposed below the slider 1, but the spring may not be disposed.

  In addition, in 1st Embodiment and 2nd Embodiment, the slider 1 and the support stand 3 may be movable to a perpendicular direction by connecting the support stand 3 to an external member.

  Further, in the third embodiment, the filler 321 is disposed in substantially the entire area of the annular cylinder 302, but the filler 321 may not be disposed in the approximately entire area of the cylinder 302.

  Furthermore, although the case where the magnetic fluid 322 moves in the cylinder 302 by rotating the slider 301 has been described in the third embodiment, the slider 301 may be rotated by rotating the support 303. Specifically, in this embodiment, since the support 303 and the cylinder 302 are integrated, the cylinder 302 is rotated by rotating the support 303. When the cylinder 302 rotates, the magnetic fluid 322 moves in the filler 321 and the magnets 315 and 316 rotate following the filler 321 to rotate the slider 301. Even with such a configuration, the effects of the present invention can be obtained.

  In the first embodiment, the case where the slider 1 moves downward has been described. However, when the slider 1 moves upward, the magnetic fluid 22 moves following the magnet 13 to move the slider 1. An effect is obtained. In the third embodiment, the case where the slider 301 rotates counterclockwise has been described. However, even when the slider 301 rotates clockwise, the magnetic fluid 322 moves following the magnets 315 and 316, so that the effect of the present invention is achieved. can get.

1,301 slider (moving body)
2,302 cylinder (tubular member)
13, 315, 316 Magnet 21, 321 Filler 22, 222, 322 Magnetic fluid 23, 24 Space 250 Communication pipe 100, 200, 300 Damper device

Claims (4)

A tubular member;
A movable body that is disposed outside the cylindrical member and is movable along the extending direction of the cylindrical member;
In the tubular member, a filler filled along the extending direction of the tubular member and a magnetic fluid passing through the filler are disposed,
A damper device, wherein the moving body is provided with a magnet.   The damper device according to claim 1, wherein the filler is made of a ferromagnetic material. The cylindrical member extends in a straight line,
In the cylindrical member, there are formed spaces formed at both ends in the longitudinal direction with the filler interposed therebetween, and communication passages connecting the two spaces at both ends. The damper device according to claim 1 or 2.   The damper device according to claim 1 or 2, wherein the cylindrical member is formed in an annular shape.

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